# #Author：Xu Yirong
# vowels = set('aeiou')
# word = 'hello'
# #并集
# u = vowels.union(set(word))a
# print(u)
#
# u_list = sorted(list(u))
# print(u_list)
#
# #difference
# d = vowels.difference(set(word))
# print(d)
#
# #intersection
# i = vowels.intersection(set(word))
# print(i)

vowels_07 = set('aeiou')
word = input("Provide a word to search for vowels:")
found = vowels_07.intersection(set(word))
for vowels_07 in found:
    print(vowels_07)